Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 240a+200（20－a） ≥4500 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        240 * a + 200 * ( 20 - a ) ≥4500         (1)

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    From inequality(1)：
         a ≥ 25/2

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    The final solution set is :
         a ≥ 25/2

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